package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import io.lettuce.core.dynamic.annotation.Value;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        //若地址簿为空则抛出异常
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        //若菜品为空则抛出异常
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(userId).build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.isEmpty()) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //构造订单数据
        Orders order = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, order);
        order.setOrderTime(LocalDateTime.now());
        order.setStatus(Orders.PENDING_PAYMENT);
        order.setPayStatus(Orders.UN_PAID);
        order.setUserId(userId);
        order.setPhone(addressBook.getPhone());
        order.setConsignee(addressBook.getConsignee());
        order.setAddress(addressBook.getDetail());
        order.setNumber(String.valueOf(System.currentTimeMillis()));
        //向订单表插入1条数据
        orderMapper.insert(order);

        //向订单明细表插入n条数据
        ArrayList<OrderDetail> orderDetails = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(order.getId());
            orderDetails.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetails);

        //清空购物车
        shoppingCartMapper.deleteByUserId(userId);

        //封装并返回VO数据
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(order.getId())
                .orderAmount(order.getAmount())
                .orderTime(order.getOrderTime())
                .orderNumber(order.getNumber())
                .build();
        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

//        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//                ordersPaymentDTO.getOrderNumber(), //商户订单号
//                new BigDecimal(0.01), //支付金额，单位 元
//                "苍穹外卖订单", //商品描述
//                user.getOpenid() //微信用户的openid
//        );
//
//        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
//            throw new OrderBusinessException("该订单已支付");
//        }

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID");

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        // 根据订单号查询当前用户的该订单
        Orders ordersDB = orderMapper.getByNumberAndUserId(ordersPaymentDTO.getOrderNumber(), userId);

        paySuccess(ordersDB.getNumber());

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //通过websocket向客户端浏览器推送消息type orderId content
        Map map = new HashMap();
        map.put("type", 1);//1.来电提醒 2.客户催单
        map.put("orderId", orders.getId());
        map.put("content", "订单号：" + outTradeNo);

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 用户端分页查询
     *
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult pageQuery4User(Integer pageNum, Integer pageSize, Integer status) {
        //设置分页
        PageHelper.startPage(pageNum, pageSize);
        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        //查询订单明细并封装到VO中
        List<OrderVO> list = new ArrayList<>();
        if (page != null && !page.isEmpty()) {
            for (Orders order : page) {
                Long orderId = order.getId();
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(order, orderVO);
                orderVO.setOrderDetailList(orderDetails);
                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 查询订单详情
     *
     * @param id
     * @return
     */
    @Override
    public OrderVO details(Long id) {
        //根据id查询订单
        Orders orders = orderMapper.getById(id);
        //根据订单id查询订单明细
        List<OrderDetail> details = orderDetailMapper.getByOrderId(orders.getId());
        //将数据封装到VO中并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(details);
        return orderVO;
    }

    /**
     * 用户取消订单
     *
     * @param id
     */
    @Override
    public void userCancelById(Long id) {
        //根据id查询套餐
        Orders orderDB = orderMapper.getById(id);
        //检查订单是否存在
        if (orderDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (orderDB.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(id);

       /* if (orderDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            //如果状态为待接单则设置退款（跳过退款功能）
            orders.setStatus(Orders.REFUND);
        } */
        orders.setStatus(Orders.CANCELLED);

        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        //更新订单状态、取消原因、取消时间
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     *
     * @param id
     */
    @Override
    public void repetition(Long id) {
        //获得用户id
        Long userId = BaseContext.getCurrentId();

        //根据订单id查询订单明细
        List<OrderDetail> detailList = orderDetailMapper.getByOrderId(id);

        //利用stream流将detail转换为shoppingCart
        List<ShoppingCart> shoppingCartList = detailList.stream().map(orderDetail -> {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(orderDetail, shoppingCart, "id");//忽略id
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());
            return shoppingCart;
        }).collect(Collectors.toList());

        //将购物车列表批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 条件订单搜索
     *
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        //开启并进行分页查询
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        //有些订单含有菜品信息需要单独封装
        List<OrderVO> orderVOList = getOrderVOList(page);
        return new PageResult(page.getTotal(), orderVOList);
    }

    /**
     * 各个状态的订单数量统计
     *
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        //查询各个状态的数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);
        //封装并返回
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }

    /**
     * 接单
     *
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 拒单
     *
     * @param ordersRejectionDTO
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());
        //因为涉及支付（本项目忽略），所以为了安全防止输入数据被篡改要先查询数据库
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            // 订单只有存在且状态为2（待接单）才可以拒单
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        /*//支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == Orders.PAID) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }*/

        //更新订单信息
        Orders orders = Orders.builder()
                .id(ordersRejectionDTO.getId())
                .status(Orders.CANCELLED)
                .cancelReason(ordersRejectionDTO.getRejectionReason())
                .cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 取消订单
     *
     * @param ordersCancelDTO
     */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

       /* if (ordersDB.getStatus().equals(Orders.PAID)) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }*/

        Orders orders = Orders.builder()
                .id(ordersCancelDTO.getId())
                .status(Orders.CANCELLED)
                .cancelTime(LocalDateTime.now())
                .cancelReason(ordersCancelDTO.getCancelReason())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 派送订单
     *
     * @param id
     */
    @Override
    public void delivery(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        //如果订单不存在或状态不是已接单则无法派送，抛出异常
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //更改订单状态为派送中
        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.DELIVERY_IN_PROGRESS)
                .build();
        orderMapper.update(orders);
    }

    @Override
    public void complete(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        //如果订单不存在或状态不是派送中则无法派送，抛出异常
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //更改订单状态为已完成
        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.COMPLETED)
                .deliveryTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    @Override
    public void reminder(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        //如果订单不存在抛出异常
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //封装催单信息
        Map map = new HashMap();
        map.put("type", 2);//1表示新的订单 2表示用户催单
        map.put("orderId", id);
        map.put("content", "订单号" + ordersDB.getNumber());

        //将催单信息发送给客户端
        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }

    /**
     * 将page转换为List<OrderVO>
     *
     * @param page
     * @return
     */
    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        List<Orders> ordersList = page.getResult();
        List<OrderVO> orderVOList = new ArrayList<>();
        //如果条件查询未查到分页则结束封装
        if (ordersList != null && !ordersList.isEmpty()) {
            //将所有的订单转为VO对象并返回
            ordersList.forEach(orders -> {
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                //获取并设置订单菜品信息
                String orderDishes = getOrderDishesString(orders);
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            });
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesString(Orders orders) {
        //查询订单菜品信息（菜品名称和数量
        List<OrderDetail> detailList = orderDetailMapper.getByOrderId(orders.getId());
        List<String> orderDishList = detailList.stream().map(detail -> {
            // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
            String orderDish = detail.getName() + "*" + detail.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());
        return String.join("", orderDishList);
    }
}
